Module: wine Branch: master Commit: d5058fb304b72d6a0a836780ad865c6100d1a4c8 URL: https://source.winehq.org/git/wine.git/?a=commit;h=d5058fb304b72d6a0a836780a...
Author: Nikolay Sivov nsivov@codeweavers.com Date: Wed May 27 10:14:23 2020 +0300
dwrite: Implement alternate substitution (GSUB lookup 3).
Signed-off-by: Nikolay Sivov nsivov@codeweavers.com Signed-off-by: Alexandre Julliard julliard@winehq.org
---
dlls/dwrite/opentype.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 83 insertions(+), 1 deletion(-)
diff --git a/dlls/dwrite/opentype.c b/dlls/dwrite/opentype.c index 81b6aaa229..c815165505 100644 --- a/dlls/dwrite/opentype.c +++ b/dlls/dwrite/opentype.c @@ -569,6 +569,14 @@ struct ot_gsub_singlesubst_format2 UINT16 substitutes[1]; };
+struct ot_gsub_altsubst_format1 +{ + UINT16 format; + UINT16 coverage; + UINT16 count; + UINT16 sets[1]; +}; + struct ot_gsub_chaincontext_subst_format1 { UINT16 format; @@ -3256,6 +3264,23 @@ static inline unsigned int dwrite_popcount(unsigned int x) #endif }
+static inline unsigned int dwrite_ctz(unsigned int x) +{ +#if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3))) + return __builtin_ctz(x); +#else + unsigned int c = 32; + x &= - (int) x; + if (x) c--; + if (x & 0x0000ffff) c -= 16; + if (x & 0x00ff00ff) c -= 8; + if (x & 0x0f0f0f0f) c -= 4; + if (x & 0x33333333) c -= 2; + if (x & 0x55555555) c -= 1; + return c; +#endif +} + static inline unsigned int dwrite_log2i(unsigned int x) { #if defined(__GNUC__) && ((__GNUC__ > 3) || ((__GNUC__ == 3) && (__GNUC_MINOR__ >= 3))) @@ -4505,6 +4530,61 @@ static BOOL opentype_layout_apply_gsub_single_substitution(struct scriptshaping_ return ret; }
+static BOOL opentype_layout_apply_gsub_alt_substitution(struct scriptshaping_context *context, const struct lookup *lookup, + unsigned int subtable_offset) +{ + const struct dwrite_fonttable *gsub = &context->table->table; + UINT16 format, coverage, orig_glyph, glyph; + unsigned int idx, coverage_index, offset; + BOOL ret; + + idx = context->cur; + orig_glyph = glyph = context->u.subst.glyphs[idx]; + + format = table_read_be_word(gsub, subtable_offset); + + if (format == 1) + { + const struct ot_gsub_altsubst_format1 *format1 = table_read_ensure(gsub, subtable_offset, sizeof(*format1)); + unsigned int count, shift, alt_index; + + coverage = table_read_be_word(gsub, subtable_offset + FIELD_OFFSET(struct ot_gsub_altsubst_format1, coverage)); + + coverage_index = opentype_layout_is_glyph_covered(context, subtable_offset + coverage, glyph); + if (coverage_index == GLYPH_NOT_COVERED) + return FALSE; + + if (coverage_index >= GET_BE_WORD(format1->count)) + return FALSE; + + offset = table_read_be_word(gsub, subtable_offset + + FIELD_OFFSET(struct ot_gsub_altsubst_format1, sets[coverage_index])); + + count = table_read_be_word(gsub, subtable_offset + offset); + if (!count) + return FALSE; + + shift = dwrite_ctz(lookup->mask); + alt_index = (lookup->mask & context->glyph_infos[idx].mask) >> shift; + + if (alt_index > count || !alt_index) + return FALSE; + + glyph = table_read_be_word(gsub, subtable_offset + offset + sizeof(count) + (alt_index - 1) * sizeof(glyph)); + } + else + WARN("Unexpected alternate substitution format %d.\n", format); + + if ((ret = (glyph != orig_glyph))) + { + context->u.subst.glyphs[idx] = glyph; + opentype_set_subst_glyph_props(context, idx, glyph); + context->cur++; + } + + return ret; +} + #define CHAIN_CONTEXT_MAX_LENGTH 64
static BOOL opentype_layout_context_match_input(struct scriptshaping_context *context, unsigned int subtable_offset, @@ -4785,11 +4865,13 @@ static BOOL opentype_layout_apply_gsub_lookup(struct scriptshaping_context *cont case GSUB_LOOKUP_SINGLE_SUBST: ret = opentype_layout_apply_gsub_single_substitution(context, lookup, subtable_offset); break; + case GSUB_LOOKUP_ALTERNATE_SUBST: + ret = opentype_layout_apply_gsub_alt_substitution(context, lookup, subtable_offset); + break; case GSUB_LOOKUP_CHAINING_CONTEXTUAL_SUBST: ret = opentype_layout_apply_gsub_chain_context_substitution(context, lookup, subtable_offset); break; case GSUB_LOOKUP_MULTIPLE_SUBST: - case GSUB_LOOKUP_ALTERNATE_SUBST: case GSUB_LOOKUP_LIGATURE_SUBST: case GSUB_LOOKUP_CONTEXTUAL_SUBST: case GSUB_LOOKUP_REVERSE_CHAINING_CONTEXTUAL_SUBST: